Adding machine



June 22 1926.

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7 Sheets-Sheet 4 i INVENTOR E W 5/. ML, .8 y I M, fiHMM x A TTOR/VE V June 22 1926.

vaw Q June 22 1926. LSSQQSQ R. L. MULLER ADDING MACHINE Filed Sept. 28, 1922 INVENTOR M/MAW ZJWZMW? June 22 1926. 1,590,050

R. L'. MULLER ADDING momma Filed Sept. 28. 1922 "r Sheets-Sheet s MAR. 5, I920 JOHN DOE INVENTOR Tram/5 June 22 ,'1926. 1,590,050 v -R.L.MULLER ADDING MACHINE Filed Sept. 28. 1922 7 Sheets-She'et 7 ILDQ'MNQLIQLOQ'NNHSI lov co comq-mmr-lc] 4 11V VENTOR Bk if M A TTORNEY Patented June 22, 1926.

5 UNITED STATES ATEN OFFICE;

Bonnier MULLER, on DETROIT, MICHIGAN, 'A'ssre non To Benn-onens ADDING Mnonrnn COMPANY, or DETROIT, MIorII-e-An, A oon'PonA'rIon or MICHIGAN".

' ADDING MACHINE;

Application filed September 28, 1922. Serial No. 591,010.

The object of the present invention is to facilitate computing or accumulating the duration of periods or intervals of time elapsing between chronological points of time, and the principal object of the invention is to provide for automatically calcu-- iating the duration of an interval of time extending from a'point of time betoreto a point of time after one oclock. The differencebet-ween the time of the beginning of any period or interval and the time of the ending of the period would represent the duration of the period, but in computing the duration of a period extending over one oclock by subtracting the time of the beginning of a period from the time of its ending, it is necessary to provide for a correction of twelve hours due to the double chronological numbering ot' hours from 1 to 12 instead of from 1 to 2 1 or, in other words add twelve hours to the time of the ending of the period. For example, the duration of the period beginning thirty-four minutes atter tw-elve and ending fifty-eight minutes after-twelve isi12z58 minus 12 :34: or 2 1 minutes, but the-duration of a period extending from forty-six minutes after twelve to ten minutes after one would be 1 :10 plus 12:00 or 13 hours and 10 minutes minus 12 hours and 46 minutes equals 24minutes.

A machine, embodying my invention, may be used for various purposes in connection with the computation or accumulation of the lengthof different periods of time. For example it may beused in factories for timing operations performed by workmen employed on a piece-work basis, by accumulating the periods of time elapsing between the points of time, printed or written on a workmans time slip to indicate the times of starting and stopping work and then dividing the total elapsed time by the number of pieces of work or operations completed or pert'ormed. For the sake of convenience, however, it will be described as used to compute the time during which current is saved on electrically operated railroads, where a con sid-erable saving of electric current, particularly in mountainous regions, may be effected by boasting, or in other words, by shutting off the current when the car runs down grade under its own momentum, the current being turned on again whenthe speed of the car falls below thespe'ed necessary to maintain the prescribed" "schedule.

elations of the machine.

Inthe course of the day or the run of the train, a careful motorman may beable to save a considerable amount ofcurrent by thus taking advantage of downgrades, the practice being to determine a motormans 'efliciency by the amount of current he saves, as estimated from the time during which the current is shut 01? while the car is in mo- .tion.

vided a clock register, which prints the time of the day every time the current is shut ofl? or turned'on. At the end of the days run,

In each train of cars, there is pro' or any other desiredor suitable period, the

printed slips, with the motormans name printed thereon are collected and the total elapsed time, represented bythe difierences between the various times of turning the currentofi and on, is calculated therefrom.

'The machine embodying my invention is adapted to perform this work of computing the total elapsed time. i

. While my invention may be embodied in any type of calculating machine, Iprefer to apply it, but without limitation thereto, to thewell-known type of Burroughs subtracting machine in which provision is made for automatically shifting the accumulator mechanism from a subtracting to an adding condition and vice versa upon successive op- 7 My invention is, however, also adapted for use in a machine in which such shifting is performed manually. To compute the total time, during which a motorman has saved current by coasting, the duration of each period, during which the current is shut coli, as represented by the pairs of ed and on items the motormansvclock register, is entered into the machine by first operating it in subtracting condition with the numeral keys representing the time the current was shut appearing on the printed slip taken from and #2 stops in the two series or banks of stops, ordinarily operated by the keys in the tens of hours and units of hours banks, respectively, so that the appropriate actuating racks are limited under the control of such operated stops to add twelve hours to the accumulator during such extra operation.

I also provide means under the control of ferred form of embodiment of which is illustrated in the accompanying drawings and described in detail hereinafter.

Of said drawings, Figure 1 is a skeletonized sectional perspective view of an adding machine of the well-known Burroughs type, with some of the well-known parts broken away and many other of such parts, including the keyboard, omitted, and with the frame shown partly in outline all for the purpose of more clearly bringing out the construction and arrangement of those particular parts introduced for carrying out the present invention; Fig. 2 is a right side sectional elevation of the machine, showing the parts in normal condition with the counters normal key depressed and the subtracting'lever in subtracting position; Fig. 3 is a similar left side sectional elevation of the machine; Fig. 1 is a skeletonized sectional plan, taken in different planes to more clearly illustrate the invention and showing many of the parts broken away and omitting many others; Fig. 5 is a right side View somewhat similar to Fig. 2 but not embracing as many parts and. further differing from Fig. 2 in that it illustrates the condition which obtains near the end of the first operation with the subtracting lever in adding position and the one oclock key depressed to add 1.2 during the succeeding operation effected by such key; Fig. 6 is a perspective view of the tens of minutes accumulator elements; Fig. 7 is a perspective view illustrating the line spacing mechanism in normal condition and with some of the parts broken away; Fig. 8 is a plan view of the right side portion of the machine with the keyboard removed and many other parts omitted to avoid confusion; Fig. 8 shows an example of a slip printed by the motormans clock register to record the time of turning on and off the current; Fig. 9 is a detailed right side elevation of some of the parts shown in Fig. 5, and shows the condition which obtains near the end of the first operation of the machine with the one oclock key depressed and just at the time the numeral keys are being released; Figs. 10 and 11 are enlarged detailed sections taken on the line 10-10 of Fig. 8, Fig. 10 showing the one oclock key and certain associated parts in normal position and Fig. 11 showing the same parts in the positions they assume with this key depressed; and Fig. 12 is a developed or extended view showing the numbered peripheries of the tens of minutes number wheel and one of the other number wheels of the accumulator.

The invention is shown herein, as stated above, applied to a machine of the wellknown Burroughs type for the purpose of illustration only and in view of the dis closures in numerous issued patents, it is unnecessary to describe the machine proper in all of its departments. Reference may be had in this connection to the Kilpatrick Patent No. 1,152,517, issued September 7, 1915, the Rinsche Patents Nos. 1,1723% and 1,179,564, issued February 22, 1916, and April 18, 1916, respectively, and my Patent No. 1,397,774 issued November 22, 1921. 111 view of the relationship of the disclosures in this and my aforesaid patent, I shall for the most part use reference characters corresponding to those of the latter to designate corresponding parts, these reference characters in many instances being symbol numbers by which these parts are commercially known.

The customary actuating racks 1510 (Figs. 2 and 3) are shown mounted in the usual way for carrying purposes on levers (511 normally upheld by a swinging frame or bail 613 and carrying at their rear ends segmental series of type plates 618. These racks are individually released and their descent controlled by the usual stop wires 270 set by the depression of the numeral keys 291 of the ordinary kind.

Accumulator and automatic shift therefor.

The number 916 designates a set of pinions adapted to cooperate with the actuating racks 610 in the ordinary way for performing addition. These pinions are fastened respectively to the numeral wheels 916 (Figs. 2, 6 and 12) which exhibit registrations through the customary sight openings in a cover plate, not shown in the drawings. The numeral 916 (Figs. 2, 3 and 6) designates an additional set of pinions constantly in mesh with the pinions 916 and having the same number of teeth and being adapted to transmit movement to said pinions 916 in, subtracting operations. Both sets of pinions are carried in a cradle 910 (Fig. 3) pivotally mounted in a rocking frame 910, such as that ordinarily employed in a Burroughs subtracting machine.

Each of the registering wheels 916, except that for registering tens of minutes, is peripherally inscribed with the usual series of numerals from O to 9 inclusive, but the tens of minutes wheel is peripherally inscribed with a double set of numerals from 0 to 5 inclusive, and both the upper and lower pinions, appropriated to this wheel, have double carrying pawls 924, as best shown in Figs. 1, 2 and 6, as in each complete revolution of this numberwheel two carrying operations take placefone'at each time the number wheel passes from 5 to O. This is due to the fact that there are'six'ty seconds to a minute and it is necessary to carry 1 from the tens of minutes wheel intothe units of hours wheel every time the tens of min.- utes wheel passes from 5 to O, or strictly speaking from fifty-nine minutes to sixty minutes. It will be understood that the double carrying pawls 92 1' trip the corresponding transfer pawl 413 twice during each revolution of the number wheel to effect the carrying operations in the usual way and each of the associate pinions 916 and 916 has twelve teeth instead of the customary ten, the teeth of the corresponding actuating rack 610 being of a' corresponding pitch.

' For the purposes of the present invention, I employ the mechanism, disclosed in my aforesaid patent, for automatically shifting from one set of accumulator wheels to the other in the successive operations of the machine underthe control of a so-called counters normal key, like that disclosed and numbered 3.") in said Kilpatrick patent. In my said patent the stem of the corresponding key is numbered 14:5 in Fig. 17. When the counters normal key, numbered 35 in the present drawings, isv depressed'to condition the machine forautomatically shiftin the registering mechanism for addition and subtraction upon successive operations of the machine as just stated,the widened lower end of the key stem 35 lowers a studfast on an arm 341 secured to a shaft '34 which carries the usual arm 24: '(Figs. 1 and 3) contacting with and overlying a stud 23 on a widened portion 87 of a link 87. This mechanism is identical to that disclosed in my said patent, as well as in said Kilpatrick patent, and requires no further description iere. V v

The familiar rocking a'r1n813, (Fig. 3) which carries the wiper pawl 821, has "a roller stud 1.6 overlying and normally con tacting with a lever 17 which is pivoted upon a frame stud 17 a at its rear end and is connected at its forward endwiththe Stud 16 by'a spring 17 ,-as disclosed in said Kilpatrick patent. Upon this lever interinediateits-ends is pivotally mounted a push piece or'lever 18 which is adapted to act upon a rocking plate 87 to swing it one way or the other. This plate, the same as in my said patent, has an upwardly extending arm which carries a stud projecting through a slot 87 in the widened portion 87 of the link 87 which extends forwardly and is pivoted tothe usual subtraction lever 88 which projects through the keyboard and has a handle by which it may be thrown forward and back. This lever corresponds to the one designated 10 in the said Kilpatrick patent and to the correspondingly numbered lever 88 of my said patent, the two positions of the lever in the present instance being indicated by the words Off and On which correspond to the positions marked Subtract and Add,respectively, in my patent. An arm 90, which does the work of shifting the accumulator is journaled on the rod 77 carrying the lever 88. The arm 90 has pivoted to it a link 91 which extends rearwardly to the vicinity of the power shaft 800. The latter carries a cross arm 92 having upper and'lower studs 92 and 92?. The link is bifurcated at its rear end for the purpose of cooperation with these studs. A. rearwardlyextending arm 88 of the lever 88 is coupled to a link 93 bifurcated at its lower end and guided by a frame stud 94. This link has an car 93 carrying a stud which occupies a slot 91 in the link 91. With the lever 88 thrown forward, that is to say to the off position, as shown in Fig. 3, to subtractively enter in the accumulink 91 sothat the upper hook-shaped por-' 'tion of the rear of the latter is in line with the stud 92. Consequently, when the machine is operated with the lever '88 in off position and the power shaft 800 is driven in a counter clockwise direction, the link 91 will be forced rearwardly and will correspondingly operate the arm 90 with the effect ofdisengaging the registering wheels 916 from the racks and then rocking the cradle 910 to the subtraction position. This, it will be understood, occurs on the forward stroke of the machine at the end of which time the stud 16 .will depress the arm 17 and with it the push lever 18, moving the roller '18 out of contact with the notch in the plate 87 with which it has been in engagement and permitting the spring, connected to the lower end of the push lever 18 to rock this lever. During the return stroke, as the arm 17 ascends unbrings the shoulder of the lower branch of 7 its bifurcation in line with the lower stud 92 onthe cross arm 92 so that in the next operatlon of the machine the said link 91 will be thrust forward and the registering mechanism put again into on condition. Now, when the machine is again operated, with the lever in on position and the number representing the time when the current is again turned on by the motorman set up on the keyboard, the registering wheels 916 will be rocked into mesh with the racks 610 to add the amount in the register.

It will be obvious that to accumulate in the accumulator the total duration of the periods of time during which current is not used, or in other words during which the train or car is coasting, the time when the current is first shut off, as indicated by the printed record strip taken from the motormans clock register, is set upon the keyboard and the machine is operated with the lever 88 in of? position, this amount thus being subtractively entered in the accumulator. The time when the current is again turned on is then set upon the keyboard and the machine operated to add this amount to the accumulator, the lever 88 hav ing been automatically shifted to on position near the end of the preceding operation. The items of each pair representing the beginning and ending of each period of coasting are in this way successively entered in the machine, the registering mecln anism being automatically shifted from off to on position and vice'versa.

One ocZoolc mechanism.

lVhen entering in the accumulator, the numbers representing the time of the ending of a period extending over the 1:00 oclock point of time, it is necessary to make a correction of twelve hours, by adding twelve hours, as above explained. To this end, a special key is employed for automatically effecting, as an incident to the operation of the machine to add the amount representing the time of the end of the period, an extra or additional operation of the machine, with the subtraction lever 88 maintained in the on position, and with the 2 wire stop 270 of the units of hours bank and the 1 wire stop of the tens of hours bank in obstructing position during such additional operation.

This special key, designated the one oclock key herein and numbered 1 in Figs. 1, 2, 5, 9, 10 and 11 is located in the second or tens of minutes bank of keys and in the position formerly occupied by the 8 key of that bank. The lower end of the key rests on a bell crank lever 217 which is pivotally mounted on a shaft and is normally retained in the position shown in Fig. 10 by a spring 1 fastened at its ends to a stud 217 on the lever and a projection on the usual spacing plate 210. V] hen the one oclock key 1 is depressed, the lever 217- is rocked counter-clockwise and a spring 4,

connected at its lower end to an arm 2 and at its upper end to a cross-shaft 5 raises the arm 2 so that its notch 2 engages the stud 217 thereby retaining the lever 21'? in its moved position. The rear end of the arm 2 is yoke shaped and pivoted on a crossshaft 8. A slide 214 for the third or units of hours bank of keys is slightly different than the corresponding slides 214 for the other banks of keys in that it has a rear widened portion 214 extending over into the second or tens of minutes bank, the rear portion of the slide 214 for the latter bank being offset toward the right to accommodate the widened portion 214. As is usual in the Burroughs type of machine, the slides 214 are operated through the customary levers 217, by the numeral keys in the respective banks, to move the slides rearward ly and thereby lock the depressed keys in depressed position and lock the other keys in the particular banks against operation. As best shown in Fig. 10, the underside of the widened portion 214 of the slide for the third bank is normally engaged by a roller 2 journaled on an extension 2 of the arm 2, so that if the one oclock key 1 is depressed before a key in the units of hours bank is depressed, the spring 4 is prevented from raising the arm 2 to engage its notch 2 with the stud217 and hence the spring l restores the bell crank lever 217 as soon as the operator releases the one oclock key. WVhen, however, a key in the units of hours bank is depressed, the corresponding slide 214 is moved rearwardly to the position shown in Fig. 11 so that when the one oclock key 1 is subsequently depressed the arm 2 is raised and its notch 2 engages the stud 1 and latches the lever 217* in operated position.

As is well known in Burroughs machines, the slides 214, which have been moved rearwardly by depression of keys, are restored to normal position near the end of the operation of the machine by the restoring bail 202 (Fig. 2) thus releasing the depressed numeral keys. lVhen the slide 214 for the third bank is thus restored, the forward inclined or beveled edge of its widened portion 214 engages the roller 2 thus camming the lever 2 to the normal position shown in Fig. 10 and releasing the lever 217, which is thereupon restored almost to normal position by its spring 1 complete restoration being delayed until later as will be described presently. It will thus be seen that the one oclock key and the lever 217 are not retained in operative position unless a key in the third or units of hours bank has been operated and that they are released near the end of the operation of the machine and at the same time that the depressed numeral keys are released.

To the forward end of the lever 217 is pivoted the upper end of a hinged link composed of the two sections 6 and 7 pivoted together by a pin 8 (Figs. 1, 2, 5 and 9.). The section 7 has. an ofiset lip 7 ex tending into the path of a lower extension of the section 6 to limit movement of the sections relative to each other'under tension of a spring 9 connected at its opposite ends to laterally projecting ears on the two sections. The lower end of the link section 7 is pivoted to the rear end of a hook-shaped arm 10 pivoted at its forward end by a stud 1O centrally to a link 11 which forwardly of the stud 10 is connected to a link 13 by studs 11 and 11 (Figs. 4 and 5) projecting through slots 13 in the link 13. The rearend of the link 11 is pivotally connected at 19 to the upper end of a lever 19 journaled on the shaft 600. This lever has a yokeshaped bearing, and is prevented from moving longitudinally of the shaft 600 by suitable collars, as shown in Fig. 4. A spring 30 is connected at one end to a stud 20, projecting from the lower end of the lever 19, and at its opposite end to a screw stud 31 on the machine frame.

The forward end of the link 13 is pivoted to an offset yoke shaped leg 14 of a finger, piece 14 (Figs. 1 to 5) which is mounted on the usual cross shaft 457 and is prevented from lateral displacementas the sides of the finger piece are positioned'between the two sections of the plates 210 which act as the guides for the actuating racks 610 controlled by the units and tens of hours banks of keys. The finger piece 14 comprises the two fingers 14 and 14 connected by the integral cross straps or bars 14 The lower end of the finger 14 is curved so that it engages the second or #2 wire stop 270 of the units of hours bank or series and the curved lower end of the finger 14 engages the first or #1 wire stop 270 of the tens of hours bank. The upper end of the restoring bail 613 carries a stud 613 which projects into a cut-out portion forming the hooked end of the arm 10. The upper edge or side 10 of this cut-out portion is concentric with the shaft 600, carrying the bail 613, to permit oscillation of the stud 613 at each normal operation of the machine, without affecting the arm 10. When the one oclock key 1 is depressed, the upperedge 10 of the cut out portion of the hook arm bears against the stud 613 and hence the sections6 and 7 of the split link break oint and the spring 9 is placed under greater tension. With the numeral keys representing the end of the period extending over 1:00 oclock, and the one oclock key depressed and. the subtraction lever 88 in the on position, the machine is now in condition for adding the number, representing the end of the period and this number is addedto the accumulator during the operation of the machine which is then automatically givena repeat or addiposition, the tension of the spring 9 acts to straighten out the link sections 6 and 7, thereby lowering the hook arm 10 so that upon return stroke of the restoring bail 613 the stud 613 engages the shoulder 10 and draws the hook arm lO and link 11 rearwardly to thev positionsshown in Figs. 5 and 9, the lever 19 being rocked clockwise (Fig. 5), tensioning its spring 30. During this rearward movement of the hook arm 10 and link 11 the finger piece 14 is blocked against inward movement by the stop wires 270, which are engaged by the fingers 14 and 14, the wires being connected to the corresponding key levers 217 which are locked against operation by the slides 214. Therefore, the link 11 is drawn rearwardly placing spring 15 which is connected at its front end to a pin 13 and at its rear end to the pin 11, under tension until near the end of the return stroke of the machine when the usual key restoring bail 202 is rocked by the by-pass pawl 623, as shown in Fig. 9, to restore the slides 214 to their normal position, thereby releasing and restoring the de pressed numeral keys 291 representing'the end of .the period extending over 1:00 oclock. l Vhen theslides 214 are so restored, the spring 15 draws the link 13 and the finger piece 14 inwardly,as shown in Fig. 5. It will be understood that Fig. 9 illustrates the condition of the parts at the instant the key restoring bail 202 is in its forward releasing position, while Fig. 5 shows the condition after the bail 202 has been moved rearwardly to normal position but before the end of the first operation of the machine. When the finger piece 14 is drawn rearwardly by the spring 15, its fingers 14 and 14 force into obstructing positions the 1 and 2 stop wires 270 of the tens and units of hours banks, respectively, rocking the associated bell crank levers 217 for the corresponding numeral keys and moving the slides 214 for the units and tens of hours banks rearwardly where they become locked in the usual manner by the locking fingers 228. (Fig. 2). As stated before, the lever 88fis retained in its on position during the rep-eat or additional operation of'the machine, the automatic accumulator shifting means, above described, being temporarily disabled, as will be described later, so that during this operation of the machine the pinions 916 are rocked into mesh with the actuating racks to add twelve hours onthe accumulator, thereby making the necessary correction.

When the latching lever 2 is moved to normal position by the slide 214C for the third bank near the end of the first operation of the machine (that is, the one preceding the repeat operation), the spring 1 rocks the lever 217 and elevates the one oclock key nearly to normal positions complete restoration at this time being prevented as the pin 613 engages the notch 10 in the hook arm 10 and holds the arm 10 down until near the beginning of the repeat operation, when the pin 613 moves out of contact with the notch 10 whereupon the spring 1 completely restores the lever 21'? and one oclock key to normal.

Examples of operation.

Before proceeding to describe in detail the mechanism for automatically effecting the additional operation of the machine, and disabling the line spacing mechanism and the accumulator shifting mechanism under the control of the one oclock key, I will first explain the operation of the machine so far as it has been described and will describe the operation in connection with the entering of the items appearing on the sample slip or card, printed by a motormans clock register, as shown in Fig. 8.

Preparatory to entering the first off item, the counters normal key 35 is depressed and the. subtraction lever 88 is moved to off position as in Figs. 2 and 3. The numeral keys, representing 33 minutes after 7, which is the time that the current was first shut off, are next depressed, these keys in the present instance being the 7key in the third bank and the 3 keys in the second and first banks. The machine is then set into operation. During this operation the accumulator cradle 910 is rocked to engage the pinions 916 of the accumulator on the return stroke of the machine, thereby moving the numbered wheels 9163 of the accumulator backward to subtract 733 leaving the wheels which before the operation stood at zero, now showing 99226. I have shown in the drawings, a machine of greater capacity than is necessary to carry out the functions of the present invention and therefore I will treat the accumulator as though it had but live numeral wheels 916*. In a regularly equipped Burroughs machine the result thus obtained would be 99266, but in the present instance, as the tens of minutes wheel is provided with a double set or series of numbers from 0 to 5, inclusive, it will be seen that in turning the upper pinion wheels backward the tens of minutes wheel will be turned backward four steps from to .2, including a one step movement for the borrowing action, thus leaving the numbered wheels, as before stated, at 99226. During this operation, the subtraction lever 88 is shifted automatically to the on position, as above described. The number 741, representing the time, that is, forty-one minutes after seven, when the current was turned on, is now set up upon the keyboard and the machine operated to add this amount on the accumulator. At the beginning of the return stroke ot this operation, the units of minutes wheel is moved one step to 7 to add the extra 1 to the accumulator automatically, as is common in this type of machine and the units of minutes wheel will advance one step further to 8, the tens oi minutes wheel four steps to O and the units of hours wheel seven steps to 9, but as the carrying action is to take place from the tens of minutes wheel, as it has moved from 5 to 0, an extra one step movement will be imparted to the units of hours wheel and all the wheels to the left thus turning all of these wheels to their 0 position. The wheels will now show 00008 indicating that eight minutes have elapsed from the time the current was first shut oii' to the time it was turned on again. Near the end of the second or adding operation, the subtracting lever 88 is automatically shifted from the on to the oil? position. The number 759, which represents the time of cutting the current off again, or the beginning of the second period, as shown on the. sample slip, is then setup on the keyboard and the machine operated, the upper pinions or dials being turned backwardly until they register 99208. The subtraction lever having been shifted to the on position during such operation the number 813, representing the time that the current is turned on again or the end of the second period, is set upon the keyboard and the machine operated, as before, to add this amount to the accumulator leaving the dial wheels showing 22 minutes, the negative 1 having been added as is usual in this type of machine. The current being turned off again at fifty-eight minutes after twelve, the corresponding numeral. keys are depressed with the subtraction lever in the oii position and the machine operated, thus adding; the amount in the lower counter wheels 910 and subtracting it from the upper wheels 916. the dial wheels now standing at 98723, this number being one less than the correct result due to the. borrowing action. The next item on the printed slip being ten minutes after one, indicating the time that the current is turned on again and be ng the end of a period extending over 1:00 oclock, the numeral. keys representing 110 are now depressed, and the slide. 214 for the units of hours bank moved rearwardly to release the retaining arm 2 for the lever 217 The one oclock key 1 is now depressed and the machine operated. During the first operation 110 is added on the accumulator and near the end of the operation of the machine, the depressed numeral keys are released, where upon the tensioned spring 15, between the links 11 and 13 draws the link 13 rearwardly and thereby causes fingers M and 14 of the finger piece 14 to move'the number 2 stop wire 270 of the units of hours bank and the number 1 stop wire 270 of the tens of hours bank to operative position so that during the additional or repeat operation of the machine, an extra twelve hours is added to the accumulator, the subtraction lever 88 being retained in the on position during this additional operation of the machine. At the end of the additional operation of the machine, the dial wheels will indicate the total time elapsed over thevarious periods which, in the present example, will be 34 minutes.

Motor repeat? connections.

The motor repeat connections, that is to say, the connections under the control of the one oclock key to causethe additional operation of the machine for the purpose of making the correction of twelve hours, are shown in Figs. 1, 5 and 9 and will now be described.

lVhile the machine, vembodying my present invention, may be operated manually, I prefer to operate it by an electric or other suitable type of motor and have shown the form of motor drive customarily employed in the Burroughs type of machine and reference may be had to the Kilpatrick Patent No. 928,981 for particulars of the starting device, if desired. Reference numeral 126 designates the familiar touch bar which is mounted upon spring connected levers 127 and 127*, the former having a pin-and-slot' connection with the familiar vertical bar 128, said bar and lever 127 being connected by a spring 129. Upon depression of the touch her, the vertical bar 128 is drawn upwardly by the spring 129 so as to close the motor clutch and start the machine in operation. It will be understood that the roller stud 311 on the full stroke sector 311will operate to depress said bar 128, and open the clutch of the motor near the end of the operation of themachine, the bar 128 then being restored to normal position by the spring 129. A complete operation of the machine thus takes place at'each depression of the touch bar 126, but when an item representing the end of a period extending over 1 :00 oclock is to be entered in the machine, the additional operation of the machine is automatically effected to add the extra twelve hours. This is accomplished by means of a bail 79 mounted on the shaft 80,

the inner leg of the bail being mounted on the shaft 80 between the second and third banks, and having a V-shaped notch '79- 'crank 217 counterclockwise, as viewed in 9,10 and 11, the stud 21'? rocks the bail 79 also in a counterclockwise direction and carries with it a link 81 pivoted at one end 82 to the outer leg of the bail 79. The other'end of the link 81 is slotted at 81 to engage a stud 83 on a pendant arm 84; loosely mounted by a yokeshaped bearing on a cross shaft 85 of the keyboard. A spring 86 connected at one end to the arm 8& and at its other end to an ear 81 on the link 81 tends to cause the arm 84- to follow up the bail 79 when the latter is rocked rearward by depression of the one oclock key, but the arm at is restrained from such action by an offset lip 8t 'which is bent inwardly from the arm 84: into the path of the upwardly and forwardly ext-ending branch 622 of the pawl carrying lever 622, as clearly shown in Fig. 2. However, when the touch bar 126 is depressed to raise the starting bar 128 by the spring 129 and hence close the motor switch to start the machine in oper ation, the pawl carrying lever 622 moves in a clockwise direction as the roller 311 de scends to depress the bar 128 and as the spring 86 is now under tension, it draws rearwardly the arm 8 1 while the bar 128 is being. depressed to its limit, further rearward movement of the arm 84 then being prevented by its lower end engaging a stud 96 on the bar 128; Now as the bar 128 ascends near theendot the first operation of the machine, it is prevented from completing its return movement by the stud 96 engaging a shoulder portion 8 1 of the arm 84:, which temporarily retards the movement of said bar 128, and this is the condition of the parts shown in Fig. 9. The machine continues to complete its full stroke, and net at the mo ment of completing its full stroke, extension 622 ot-the pawl carrying arm 622 strikes the inner side of the offset slip 84, thereby moving the arm 84 to carry its shoulder 84 out of engagement with the stud 96 on the bar 128. At this moment, the spring 129 is still under suficient tension to cause the bar 128 to move upward beyond the point where it normally comes to rest, or in other words, the momentum given the bar by the spring causes it to pass the position to which it is normally raised by the spring, thereby again closing the motor clutch so that the machine is given the extra operation necessary to add the corrective twelve hours. At the moment that the arm 8 is rocked by the extension 622 to disengage it from the stud 96, the latching arm 2 for the lever 217 operated by the one oclock key is operated or depressed, by the restoration of the slide 214 for the units of hours bank, thereby permitting Disabling accumulator shift by one ocloclc lacy.

As stated above, the subtraction lever 88 is retained in its on position during the extra operation of the machine to add the corrective twelve hours and the means for accomplishing this function under the control of the one oclock key will now be de scribed. A bail 32, supported on one of the keyboards cross shaft 200%, as best shown in Fig. 1, is normally held in its rearmost position by a link 33, pivoted at 34: to the upper end of a split lever 21 and at its other end connected by a pin-and-slot connection 35 to one leg of the bail 32. The construction and function of the split lever 21, which is journalled on the machine stud 22, will be described more in detail later. The aforementioned stud 20 on the lever 19 projects through a cam slot 20 in the upper end of the split lever 21, so that when the lever 19 is rocked clockwise upon rearward movement of the hook arm 10, as above described, the upper end of the lever 21 is rocked counterclockwise thereby moving the link 33 forwardly to the position shown in Fig. 5.

Referring now to Figs. 1, 3 and 5, it will be seen that the pivot stud 72, connecting the upper end of the rod 93 with the arm 88 of the subtraction lever 88, extends through the slotted end 73 of a crank arm 73 fast on a shaft 37 supported at its right hand end in a plate 75 (Fig. 41) suitably mounted by studs and collars to the right side frame and at its left hand end the shaft 37 is supported in the upper end of an L-shaped plate 76 rigidly mounted on the pivot stud 77 which supports the subtraction lever 88. The forward end of the plate 76 is slotted to embrace one of the cross shafts 78 of the machine thereby preventing rotation of the plate 76. Also fast on the shaft 37 and in position to engage the bridge 32 of the bail 32 is an oscillating arm 36 having a notch 36 which is engaged by the bridge 32*.of the bail 32 when the bail is rocked forwardly by its spring 38 upon forward movement of the link 33. Therefore, the subtracting lever is locked by the bail 32 in its on position during the extra operation to add the necessary twelve hours. As will be described presently, the split lever 21 is latched 1n the position shown in Fig. 5 until near the end of the extra operation at which time the spring 30 rocks the lever 21 and the lever 19 to normal positions and the forward end of the slot in the forward end of the link 33 then engages the stud 35 on the bail 32 to rock it rearwardly to normal position,

thereby releasing the subtraction lever 88 and permitting it to be automatically shifted to the off position by the normal operation of the shifting mechanism, which is effective near the end of the machine operation and after the split lever 21 has been released. It will be obvious that during a normal operation of the machine, that is to say, without the one oclock key depressed, the bail 32, is held in inoperative position by the link 33 which is not operated during such operations.

Hmnmer-bloclc connections.

It is not, of course, desirable to print an item on the tally strip during the additional operation of the machine, effected by the one oclock key to add the corrective twelve hours, as the number representing the time that the current is turned on is printed during the first operation of the machine and it is not desirable to print the twelve hours entered during the second operatlon of the machine, this extra twelve hours only being added to the accumulator for the purpose of correcting the total. The split lever 21, referred to before, is employed for this purpose. The lever 21 is formed of two sections 21 and 21 pivoted together by a screw 21 and the lower section 21 is journalled on machine stud 22. A spring 25, connected at one end to a stud 26 on an offset portion of the lower section 21 and at its other end to an car 27 on the upper section 21', acts as a flexible connection between these two sections of the split lever 21. An ear or offset lip 21 on the upper section 21 engages the rear edge of the lower section to limit the relative movement of the two sections under the tension of the spring 25. The lower section 21 is in the form of a yoke journalled on the fulcrum 22 and comprising the two arms and bridge 21 As described above, when. the hook arm 10 is drawn rearwardly by the engagement of the pin 613 with the shoulder 10, the lever 19 is rocked clockwise, as viewed in Fig. 2, and movement of the stud 20 on this lever in a slot 20 in the upper section 21", of the split lever 21 causes the latter to be rocked counterclockwise. However, when the lever 19 is rocked in this manner, the hammer firing levers 716, which are of the usual wellknown construction, have not been quite returned to their normal positions and hence the rear face of the bridge 21 strikes against the front edges of the levers 716, which is permitted because of the flexible connection between the two sections of the lever 21, the two sections breaking joint and the spring 25 being placed under increased tension. As soon as the levers 716 are moved counterclockwise (Fig. 2) beyond or out of engagement with the bridge 21, the spring 25 rocks the section 21 rearwardly so that the bridge is drawn into the position above the notches 716 formed in the levers 716, this position being shown in Fig. 5. This occurs during the first operation of the machine to enter the item represented by the depressed numeral-keys with the one oclock key depressed. Near the beginningof the additional or repeat operation toadd the extra twelve hours on the accumulator, there is a limited rearward movement-of the levers 716 under tension of their firing springs, sufficient to rock the levers 16 to position the notches 716 into engagement with the bridge 21 of the split lever. This lever 21 will remain in this latched or locked condition until near the end of this additional opera tion of the machine atwhich time theusual universal restoring bail, not shown in the drawings, but which is a familiar construc tion of the Burroughs machine, will return the hammer "firing levers 716' in a counterclockwise direction sufficiently-to release the bridge 2l of the split lever 21 from the notches 716 The spring 30 connected to the stud 20 on the lever 19, as above stated, immediately rocks the lever 19 to the normal position shown in Fig. 2 and at the same time restores the split lever 21 to normal position. It will be now seen that as the split lever 21 has been latched inmoved position during the additional operation of the ma chine and until near 'theend thereof, the

lever 19-, links 11 and 13 and the finger piece 14, as well as the hook arm 10, are retained in their rearward positions, to which they have been moved by the pin 613?, until they are restored to normal position under action of the spring upon release of the split lever 21 from the firing levers 716. As the firing hammers 716 have been held against operation by the bridge 21 of the split lever during the additional operation of the machine, printing on the tally strip ofthe extra twelve hours is eliminated.

mechanism and thereof.

The line spacing mechanism is that com mon to the Burroughs machine, wherein at Line spacing climb lament each operation of the machine a slotted cam plate 40 (Figs. 2an'd 3) rocks a cross arm 41 and through link 42, crank arm 43, shaft 44. crank arm 4, link 46. lever 47 and link 48 rocks a crank arm 49 pivoted on the platen shaft 49 which is provided at its outer end with a ratchet pawl 51 having a spring connection 52 to an ofiset of the link 48 torhold the pawl in engagement with the ratchet teeth of a ratchet 53'fast to the shaft 49 carrying the usual platen 53"! The platen is carried in the usual tally strip frame 50. Through the above described connections, the pawl 51 is'reciprocated at each operation of the machine and turns the platen one step to feed the paper strip'(not shown in the-drawings) upward the desired number of spaces. With this typeof printing mechanism, there'is providedia yoke shaped lever 54 pivoted at 55 to one side of the frame 50, the object of this lever being to disengage the pawl 51 from the ratchet wheel 53 when theframe 50 is tilted back, the purpose of this being to prevent line spacing when the frame is in such condition. It is this lever 54which is employed in the present invention to disable theline spacing mechanism during the repeat operation of the machine to add the extra twelve hours under the control of the one ocl0ck7 key, it being desirable to eliminate line spacing during such repeat operation to maintain aneat appearance of the tally strip To operate the lever 54 for'thispurpose, a link 56 (Figs. 2, 4, 5 and 7) is provided and the link is pivoted at 57 totthe upper section 21" of the hammenblocking split lever 21 and is supported near its rearend on a stud 58 projecting from a suitable part of the machine and engaging in a slot or notch 56 in the link. The portion of the link projecting rearwardly beyond the slotted portion has a rear face 56 normally engaging a stud 59 projecting from an upward extension 60 of a bail. or yoke 61 mounted on the sides of the frame 50 by threaded screws 62. The left side of thebail, as viewed in Fig. 7, is provided with a curved extension 64 extending'upward into the path of astud 65 projecting inwardly from 'the tail of the lever 54., as best shown in Figs. 3 and 7. The back plate 66 of the machine is slotted at 67 (Fig. 3) to accommodate the tail of the lever 54. Normally the rear face of the link 56 engages the stud 59 thereby retaining the rear face of the extension "64 in. engaging condition with the stud65,thusholding the upper rear side of the lever 54 out of engagement with a stud 68 on the pawl 51; When, however, the upper section 21 of the split hammer blocking lever 21' is rocked forwardly by movement of the lever 19 during the first operationof the machine when the one oclock. key is depressed, as

above described, and'after the item, rep-- resenting the time the current was last turned on is printed on the tally strip during such operation, the link 56 is drawn forwardly out of engagement with the stud 59, as shown in Fig; 5. andas the lever 54 is now released its spring 69 rocks it about its pivot 55 until it is arrested by engage ment of its downwardly extending arm 54?,

with a stud 71 to which the lower end of the spring 69 isfastened. This movement of the lever 54 results in camming the pawl 51 out of engagement with the ratchet 53 V by the upper rear edge of the upper leg of c the lever 54 engaging the stud 68 on the pawl 51. 'As soon as the hammer block lever 21 hasbeen moved to normal position,

near the end of the extra or repeat operation of the machine, as above described, the link 56 will again be restored to normal position (Fig. 2) in order to permit line spacing during subsequent normal operations of the machine.

It will be understood, of course, that the items, printed onthe tally strip, will be the same as those appearing on the motormans slip, taken from the clock register, and that a total or subtotal may be printed in the usual manner at the end of the list of items to record the total elapsed time represented by the various pairs of off and on items.

I claim:

1. In a machine of the class described, the combination of manually operated amount determining devices, differential mechanism controlled thereby, an accumulator actuated by the differential mechanism, normally ineffective means for automatically operating certain of said devices, and manual means for rendering said operating means effective.

2 I11 a machine of the class described, the combination of a main operating mechanism, manually operated amount determining devices, differential mechanism controlled by said devices, an accumulator actuated by said differential mechanism, normally ineffective means for automatically operating certain of said devices during a repeat operation of the machine, and manipulative means for effecting such repeat operation and rendering said automatic means effective.

3. In a machine of the class described, the combination of an accumulator, differential mechanism for actuatin the same, manually operated devices for controlling said differential mechanism, automatic means for operating said manually operated means, and a manipulative device for controlling said automatic means.

4. In a machine of the class described, the combination of an accumulator, differential racks for actuating the same, amount determining means for controlling said differential racks, and means for controlling the extent of movement of a plurality of said racks to automatically enter in the accumulator a constant amount Whenever said last mentioned racks are controlled by said last mentioned means.

5. In a machine of the class described, the combination of an accumulator, differential racks for actuating the same, amount determining means for controlling said differential racks, and means for controlling the extent of movement of a plurality of said racks of higher orders to'enter a constant amount in said accumulator Whenever said racks of higher orders are controlled by said last mentioned means.

6. In a machine of the class described, the combination of a main operating mechanism, an accumulator, differential racks for actuating said accumulator, and means for effecting a repeat operation of the machine and controlling the extent of movement of a plurality of said racks during such repeat operation to enter in the accumulator a constantamount Whenever said last mentioned racks are controlled by said means.

7. In a machine of the class described, the combination of an accui'nulator, differential mechanism therefor, amount determining devices for controlling said differential mecha nism, means for controlling the addition of a constant amount in said accumulator as an incident to adding an amount therein under the control of the selectively operated amount determining devices, and a manually operated device for controlling said means.

8. In a machine of the class described, the combination of a main operating mechanism, manually set stops, a difierentially moved rack controlled by said stops, normally ineffective means operated by said operating mechanism for operating one of said stops and a manual device for rendering said means effective.

9. In a machine of the class described, the combination of manually set stops, differential mechanism controlled by said stops, an accumulator actuated by said differential mechanism, and automatic means for operating certain of said stops to enter a constant amount in said accumulator as an incident to entering a selected amount in said accumulator.

10. In a machine of the class described, the combination of an accumulator, differential mechanism therefor, amount dctern'iining devices for controlling said differential mechanism, and a manipulative device operated in conjunction with said amount determinii'ig devices to enter a constant amount in said accumulator as an incident to entering the selected amount in said accumulator represented by the operated amount determining devices.

11. In a machine of the class described, the combination of an accumulator. racks for actuating the same, a series of manually set devices for each rack, a key and means controlled by said key for automatically operat ing a device in each series of said devices to enter a constant amount in the accumulator.

12. In a machine of the class described. the combination of an accumulator, racks for actuating the same, a series of manually set devices for each rack, 21 key and means controlled by said key for automatically operating a device in each series of said devices to enter a constant amount in the accumulator as an incident to entering a selected amount in said accumulator under the control of the devices manually set to represent such selected amount. I

13. In a machine of the class described, the

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' tuating the same, a series of manually set devices for each rack, a key and means controlled by sald key for effecting a repeat operation of the machine and automatically p0- sitioning a device in each series of said de vices to enter a constant amount in the accumulator during such repeat opera-tion.

14. I11 a machine of the class describ-ed,-the combination of a mainoperating mechanism,

an accumulator, differential mechanism for actuating said accumulator, manually set stops for controlling said differential mechanism, means for latching the operated stops in operative position during an operation of the machine, a manipulative device, and means controlled by said manipulative device for automatically effecting a repeat op.- eration of the machine and moving certain of said stops to operative position after said first operation.

latching means has been operatedduring the first operation to release the manuallypositioned stops 15. In a machineof the class described, the combinationof amain operating mechanism, an accumulator, :diiferential 1 mechanism for actuating said accumulator, manually set stops-for controlling said difierential mechanism, means for latching the operated stops in operative position during an operation of the machine, a manipulative device adapted to be operated in conjunction with the manual positioning of said stops, means controlled by said manipulative device for automatically effectinga repeat operation :of the machine, and means controlled by said key formovingcertain of said stops to operative position when the manually positioned stops are restored to normal position during the 16. In a machine of the class described,the

combination of a main operating mechanism,

an accumulator, differential mechamsm for actuating said accumulator, manually set stops for controlllng-sald differential mechanism, means for latching the operated stops in operative position duringanoperation of the machine, a key adapted to be operated inconjunction with the manual positioning of said stops, means controlled by said key for effecting a repeat operation of the machine, means associated with certain of'said stops and including aspring, and mechanism under the control of, said'key for tensioning said spring. during the firstoperation of the machine so that the spring positions said certain stops when the manually sct stops arereleased. p p

17. In a machine of the class described, the combination of a main operating :mechanism, an accumulator, differential mech anism for actuating said accumulator, numeralkeys, stops set under the control of said keys to control said differential mech- 21. In a machine cumulator, means controlled by the special key to effect a repeat operation of the machine, and means normally in inoperative position and moved by said specialkey so thatthe operating mechanism actuates the same to move certain of said stops into position to control movement-.ofthe differential mechanism during the repeat operation and thereby entera constant amount in said accumulator. V I

a 18. Ina machine of the class described, the combinationof amain operating mechanism, an accumulator, differential mechanism for actuating said accumulator, numeral keys, stops set under the control of said keys to control said differential mechanism, a special key, means controlled by said special key for vefiecting a repeat operation of the machine, means conditioned by the operating mechanism under the control of said special key for moving certain of said stops, into operative position, and means for latch,- ingsaid last mentioned means in operated position during said repeat operation of the machine. I

19. In a machine of the class described, the combination of manually set devices, differential mechanism controlled thereby, an accumulator actuated by the differential mechanism, normally ineffective means for operating certain of said devices, manual means for rendering said operating means effective, and means normally preventing effective operation of said manual means until one of a series of such devices is operated.

20. In a device of the class described, the combination ofvan accumulator, differential mechanism vfor actuating the same, banks of manually operated devices for controlling said differential mechanism, automatic means for operating certain of said manually operated means, a manipulative device for con-v trolling said automatic means, and :means for preventing effective operation of said manipulative device until a manually operated device in one of said banks has been operated. a

of the class described, the combination of banks of stops, banks of keys for setting the same, differehtialmechanismcontrolled by the stops, an accumulatoiyactuated by the differential mechanism, normally ineffective means for automatically operating certain of said stops, a special keyfor controlling said means, a latch cooperating with said special key, and means for preventing operation of said latch, and disabled by the operation of a key in a cer tain of said banks of keys.

22; In a machine of the class described, the combination of banks of stops, banks of keys for setting'the same, differential mechanism controlled by said stops, an accumulator actuated by said differential mechanism, normally ineffective means for automatically ope at-ing certain of said devices, a special key for controlling said means, elements for latching the opera-ted stops in effective position, and normally ineffective latching means associated with said special key and rendered ellectivc upon operation of a certain one of said latching elements.

23. In a machine of the class described, the combination of an accumulator, racks for actuating the same, a series of selectively operated stops for controlling each rack, means for latching thc operated stops in effective position, a key, a normally ineffective latching device associated with said key and rendered efi'ective by the latching means for one of said series of stops, and means controlled by said key for moving certain of said stops to operative position when the selectively positioned stops are released by the latching means.

24. In a machine of the class described, the combination of an accun'iulator, differential mechanism for actuating the same, manually operated amount determining means for controlling the differential mechanism, automatic means for entering a constant amount in said machine, a key controlling said automatic means, and a device for compelling operation of the amount determining means before said key is effectively operated.

25. In a machine of the class described, the combination of a main operating mechanism, an accumulator, differential mechanism therefor, amount determining devices for controlling said differential mechanism, automatic means for controlling said differential mechanism to enter a constant amount in said accumulator as an incident to entering a selected amount, printing means for recording the amounts entered in said accumulator under the control of said amount determining means, and means for preventing the recording of said constant amount when it is entered in the accumulator.

so. In a machine of the class described, the combination of a main operating mechanism, an accumulator, differential mechanism therefor, amount determining devices for controlling said differential mechanism, normally ineffective means for controlling the entering of a constant amount in said accumulator, n'inting mechanism for recording the amounts entered in the machine under the control of said amount determining devices, and a manipulative device for rendering said means efl'ective and said printing mechanism ineffective to record said constant amount.

27. In a machine of the class described, the combination of a main operating mechanism, an accumulator, differential mechanism therefor, amount determining devices for controlling said differential mechanism, normally ineffective means for controlling the entering of a constant amount in said accumulator, printing mechanism for recording the amounts entering in the machine under the control of said amount determining devices, line spacing mechanism, and a manipulative device for rendering said means effective, disabling said line spacing mechanism and preventing the printing mechanism from recording said constant amount.

28. In a machine of the class described, the combination of a main operating mocha nism, an accumulator, differential mechanism. therefor, amount determining devices for controlling said differential mechanism, automatic means for efl'ecting the entering of a constant amount in said accumulator during a repeat operation of the machine, printing mechanism for recording the amounts entered in the accumulator under the control of said amount determining devices, and a manipulative device and connections for controlling said automatic means, effecting said repeat operation and disabling said printing mechanism during the repeat operation.

29. In a machine of the class described, the combination of a main operating mechanism, an accumulator, difl'erential mechanism therefor, amount determining devices for controlling said differential mechanism, automatic means for effecting the entering of' aconstant amount in said accumulator during a repeat operation of the machine, printing mechanism for recording the amounts entered in the accumulator under the control of said amount determining devices, line spacing mechanism, and a manipulative device and connections for controlling said automatic means, causing said repeat operation and disabling said printing mechanism and said line spacing mechanism during the repeat operation.

30. In a machine of" the class described, the combination of an accumulator, means for alternately conditioning said accumulator for addition and subtraction, difl'erential mechanism for actuating said accumulator, amount determining means for controlling the differential mechanism, automatic means for causing the entering of a constant amount in said accumulator, and a manipulative device for controlling said automatic means and disabling said conditioning means.

31. In a machine of the class described,

the combination of an accumulator, means for alternately conditioning said accumulator for addition and subtraction, difi'erential mechanism for actuating said accumulator, amount determining means for controlling said differential mechanism, automatic means for causing addition of a constant amount in said accumulator as an incident to adding a selected amount therein under the control of amount determining means, and a manipulative device'it'or controlling said automatic means.

32. In a machine of the class described, the combination of an accumulator, means for alternately conditioning said accumulator for addition and'subtraction, differential mechanism for actuating said accumulator,.

causing addition of a constant amount in said accumulator during a repeat operation, and a manipulative device for controlling said automatic means, effectinglsai'd repeat operation and temporarily disabling said conditioning means.

34. In a machine of the class described, the combination of a main operating mechanism, an accumulator, means for conditioning said accumulator for addition and subtraction upon alternate operations of the machine, differential mechanism for actuating said accumulator, amount determining devices for controlling said differential mechanism normally ineffective, means for automatically causing addition of a constant amount in the accumulator duringa repeat operation and as an incident to adding an amount therein under the control of the amount determining devices, and a manipulative device for rendering said causing means effective and maintaining said accumulator in adding condition during said repeat operation.

35. In a machine of the class described, the combination of an accumulator, means for alternately conditioning said accumulator for addition and subtraction, differential mechanism for actuating said accumulator, amount determining means for controlling the combination of an accumulator, means for alternately conditioning said accumulator for addition and subtraction, difi'erential mechanism for actuating said accumulator, amount determining means t'or controlling said differential mechanism, automatic means for causing addition of a constant amount in said accumulator as an incident to adding a selected amount therein under the control of amount determining means, printing mechanism for recording the means, line spacing mechanism, and a manipulative device for controlling said automatic means and disabling said conditioning means, printing mechanism and line spacing mechanism when said constant amount is entered in the accumulator.

37. In a machine of the class described, the combination of a main operating mechanism, an accumulator, means for conditioning said accumulator for addition and subtraction upon alternate operations of the machine, differential mechanism for actuating said accumulator, amount determining devices for controlling said differential mechanism, normally ineffective means for automatically causing addition of a constant amount in the accumulator during a repeat operation and as an incident to adding an amount therein under the control of the amount determining devices, printing mechanism for recording the amounts entered in the accumulator under the control of said amount determining means, line spacing mechanism, and a manipulative device and connections for rendering said causing means eifective, effecting said repeat operation, maintaining said accumulator in adding condition and disabling said printing and line spacing mechanisms during said repeat operation.

ROBERT L. MULLER.

amounts entered in the accumulator under the control of said amount determimng 

